Governing continuous-current motors.



"PAflENT'l-ID- FEB. 28, 1905.

G. SAUTTER. GOVERNING CONTINUOUS CURRENT MOTORS.

APPLICATION FILED AUG. 23, 1904 Patented February 28, 1905.

' UNITED STATES PATENT OFFICE.

GASTON SAUTTER, OF PARIS, FRANCE.

GOVERNING CONTINUOUS-CURRENT MOTORS.

SPECIFICATION forming part of Letters Patent No. 784,009, dated February 28, 1905.

Original application filed November 11, 1902, Serial No.

v To (all whom, it may GUN/06777,.

Beit known that I, GAs'roN SAUTTER, a citizen of the Republic of France, residing at Paris, France, have invented certain new and useful Improvements in Governing Continuous-Current Motors, of which the following is a specification.

My invention has relation to a means for governing continuous-current motors; and in such connection it relates to the construction and arrangement of parts whereby through main and auxiliary electromagnetic switches the automatic starting and the gradual automatic braking of a motor may be secured.

.In an application for patent filed .by me under date of November 11, 1902, Serial No. 130,833, a means for governing continuouscurrent motors through electromagnetic switches is described and claimed. The present application is a division of said application Serial No. 180,833, and has for its sub ject-matter ameans wherebymotors of great inertia may be automatically started and stopped, said means including not only the main switches of the previous application, but small auxiliary switches, which permit of the augmentation of the precision of the automatic control of the motor.

The nature and scope of my invention will be more fully understood from the following description, taken in connection with the accompanying drawing, forming part hereof, and which illustrates in diagram the means for automatically controlling the starting and stopping of the motor, said means embodying main features of my present invention.

Referring to the drawing, there are employed two main electromagnetic switches one for movement to the right, the other for movementto the leftand three or more starting-switches provided with auxiliary electromagnetic switches and acting upon the different sections of the starting-rheostat. The

the main 130,883. Divided and this application filed August 23, 1904. Serial No. 221,840.

switches, thereby causing the armature of the motor 6 to move to the left or to the right. \Vhen the switch-lever is shifted to close the circuit from the generator (4 through contact a and electromagnet w for movement to the left,the magnet of the switch attracts its armature and closes the contacts at and Z. (urrent from the positive pole traverses the contact Z and then the entire starting-rheostat 0. It then passes into the electric motor through 3, passes out through the terminal 1, traverses the contact in, and returns to the negative pole of the generator. Themotor therefore moves to the left with the entire rheostat for starting in the circuit. l Vhen the motor has attained a given speed and the counter electromotive force a given power, it becomes necessary to shunt one of the sections of the rheostat. This is carried out by means of the first starting switch, of which the electromagnet p is a derivation, from the terminals of the motor. Experience has shown that when it is required to operate with great precision the employment of large electromagnets always gives rise to delays on ac count of the weight and inertia of the moving parts. To each of them is therefore joined a small auxiliary electromagnetic switch. These are the auxiliary switches 11, r, and if, shown in the diagram. which govern the main switches 29, r, and z. The electrouiagnets of the three auxiliary switches 12f, w, and z" are in series, the circuit being derived from the wire leading from the terminal& of the motor and returning to the terminal 3. When the counter electromotive force of the motor has attained a given power, the auxiliary electromagnet 12 comes into action and closes its armature. Precise regulation may be effected by means of a counterweight orspring. The closing of the said armature allows the current from the source of the electricity derived from the positive pole to traverse the electromagnet y) of the mainswitch. The latter attracts its armature and closes the contact 1 which shunts the first section of the rheostat. The speed of the motor then increases, as well as its counter electroniotive force. The auxiliary switch a" in its turn e11- tors into action. It is regulated, as by the use of a heavier counterweight, as to act a little later than the auxiliary switch So soon as it closes its armature the current traverses the main electromagnet a", which closes the contact s and shunts the second section of the rheostat. It is the same with the switch 6', which acts last and cuts out the third and last section of the rheostat by exciting the main electromagnet t. It is evident, moreover, that the rheostat could be subdivided into a greater number of sections four, five, or more each section being governed by a main switch and an auxiliary switch. This method of ac tion allows the motor to be very gradually started, because the auxiliary electromagnets, which are of small dimensions, may be regulated with much greater precision than the main electromagnets, which they are required to govern. The braking of the motor is graduated by interposing graduated resistances in the short circuit of the motor. The short-circuit resistances are indicated at :1: in the diagram. Suppose that after having rotated the motor to the left, as just explained, the governing-lever is again placed between the contacts 0 (Z, the derived current which traverses the electromagnet is broken, the counter-spring of the magnet of the switch for moving to the left draws back its armature, the contacts and m are broken, and the contact w: of the magnet c is made. The circuit of the armature of the motor is then through the terminal 3, the electromagnet 7" the contact j, the three sections of the braking-rheostat w, the contact w, the electromagnet u, and the terminal 4. The motor is then closed through the entireinterpolated resistance, its speed gradually slows, and its counter electromotive force diminishes. So soon as the counter electromotive force decreases to a given degree the auxiliary relay t releases its armature. it thus breaks the derived current which traverses the electromagnet 2f, the latter breaks the contact 1/ and makes the contact w, and the ln'eaking ot' the contact a causes the last section of the starting-rheostat 0 to reenter the general circuit. The making of the contact (1! short-circuits the third section of the braking-rheostat in the circuit of the armature of the motor. There therefore only remains in the short circuit of the motor the two first sections of the rheostat. The speed of the motor continues to decrease, and the magnet of the auxiliary relay 1* releases in its turn its armature. The same takes place in the main relay r, the magnet of which releases its armature and breaks the contact s and makes the contact in. The second section 0 of the starting-rheostat comes into circuit,

while the second section of the breaking-rheostat is short-circuited. Lastly, a little later the magnet of the third auxiliary relay 7) releases in its turn its armature. In the main relay the contact (1 is broken and the contact a" made. At this moment the third sec- .tion of the braking-relay is short-circuitcd.

The motor is therefore closed only upon itself that is to say, upon the resistance proper of the armature. it is short-circuited to the greatest possible extent, and therefore quickly stops. it will be seen that at the moment of stoppage the whole of the system is in identically the same position as at the commencement. The braking-rheostat is short circuited, while the starting-rheostatis in the circuit of the motor.

in the drawing the contact-bars w w w, 1 s 11, /t 1:, I m, and w are insulated from their carriers, as indicated at w. The lield b For the motor 7) is wound in shunt, and the holdcurrent is never reversed. \Vhen the current through the armature is reversed. the direction of rotation of the motor is reversed.

Having thus described the nature and object of my invention, what l claim as new, and desire to secure by Letters Patent, is

1. In an apparatus for controlling continuens-current motors, a starting-rheostat and a brakingrheostat, each arranged in sections, coils of main electromagnetic switches controlling each section of both rheostats, and auxiliary means for briiiging successively into operation the switches to cut out the sections of the starting-r11eostat as the counter electromotive force of the motor increases and to cut out the sections of the brakirig-rheostat when the main circuit from a generator to the motor has been broken.

2. in an apparatus for controlling continuens-current motors, a starting-rheostat and a braking-rheostat each arranged in sections, coils of main electromagnetic switches controlling each section of both rheostats, and auxiliary electromagnetic switches responsive to the counter electromotive force of the 1no tor and arranged to bring successively into operation the main switches to cut out the sections of the starting-rheostat as the counter eleetromotive force increases and to cut out the sections of the braking-rheostat when the main circuit from a generator to the motor has been broken.

In testimony whereof I have hereunto set my signature in the presence of two subscribing witnesses.

GASTON SAUTFIGR. \Vitnesses:

C. DE hlESTl-LAL, HlxxsoN (J. Coxn.

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